328 Lxxiii. COMPOSITE (OLIVER AND hiern). [Pliichea. 



in corjmbose or few-headed terminal cymes. Corolla " white, yellow 

 or lilac." 



A genus of the warmer regions of both hemispheres, numbering from 20 to 30 

 species. 



Leaves all undivided, quite entire or denticulate. 



Petioles J--^ in. long 1. P. odorata. 



Petioles shorter or obsolete. 



Leaves decurrent in toothed wings 2. P. ovalis. 



Leaves not decurrent. 



Leaves small, ^-~ in. long 3. P. sordida. 



Leaves larger, 1-3 in. long. 



Outer involucral bracts ovate, acute or apiculate. 



Leaves membranous or subcoriaceous . . 4. P. Dioscoridis. 

 Outer involucral bra -ts broadly ovate, obtuse, 



not apiculate. Leaves coriaceous • • • 5. P. lanceolata. 

 Some of the leaves quite entire, other deeply incise-den- 



tate 6. P. heterophylla. 



Leaves deeply pinnatifid 7. P ^pinnatijida. 



1. P. odorata, Cti6'5. Diet. xlii. p. 3. Herbaceous? Branches 

 sabterete, striate, tomentellons. Leaves oval-oblong, obtase or sub- 

 acute, narrowed at the base into the petiole, minutely denticulate, 

 puberulous on both sides, 2-5 in. long by f-1 J in. wide, flat. Petioles 

 ^— I in. long. Capitnla campanulate-hemispherical, many-flowered, 

 ^ in. long, on short pedicels, in dense branched corymbose cymes 4 in. 

 diam. Scales of the involucre pluriseriate ; inner linear, acute, glabrous ; 

 outer oval or oblong, obtuse, pubescent, shortly ciliate, successively 

 shorter. Receptacle flat, -^ in. diam,, naked. Achenes small, scat- 

 tered with minute setae. — DC. Prodr. v. p. 452, cum syn. 



Upper Guinea. Senegambia, Perro^^g^ .' Lclierre! 



Widely spread in Tropical America. P. senegalensh, Klatt. in Ann. So. Nat. Ser. 

 v., xviii. 368, appears to be this species. 



2. P. ovalis, DC. Prodr. v. p. 450. Shrubby, tawny-pubescent or 

 tomentose. Branches terete, striate, leafy. Leaves elliptic or ovate, 

 obtuse or subacute, denticulate-serrate, narrowed towards the sessile 

 auriculate-clasping base, decurrent in unequally dentate wings, 

 1-2 in. long by |-1 in. wide. Capitula on short unequal pedicels, 

 J-^ in. diara., in dense corymbose terminal panicles. Scales of invo- 

 lucre lanceolate, or inner linear, subrigid, pluriseriate, imbricated, acute 

 or subacute, puberulous, shortly ciliate ; outer successively shorter. 

 Receptacle flat, naked. Achenes glabrous or with a few short hairs on 

 the angles. Pappus sordid, uniseriate, scabrous. — Baccharis ovata, 

 Sieber! PI. Seneg. Exsicc. n. 61 ; J5. ovalis, Pers. Synops. ii. p. 424, 

 ex DC. I.e. 



Vpper Guinea. Senegambia, Brunner ! Sieber ! 

 Occurs also in Atlantic Islands and N.W, India. 



3. P. sordida, 0. 8c H. Shrubby, 2-3 ft. high or more. Leaves 

 narrowly obovate, obtuse, narrowed to the sessile base, entire or 

 nearly so, tomentose or both sides, ^-f in. long. Heads campanulate, 

 J in. long, on short pedicels, in numerous small globose cymes. Female 

 florets numerous ; male about 5. Scales of the involucre pluriseriate, 



